This alarm is a new type which is focused on digital products with USB. It will make function when the line is broken or short circuit.

Features and specification:
The capability is steady, and convenient to use
It’s a full-new product for protection and security, it’s the ideal choice to product the cell phone, laptop, computer, digital camera and so on
Voltage: 3 batteries of AA 1.5V
When the volume becomes low obviously, please change the battery immediately. If you not use it in a long time, please take off the battery
 
Package included:
1x alarm